An audit is to be carried out on the Mexican company that leased the aircraft involved in a deadly crash in Cuba on Friday that has left 110 people dead.
The Boeing 737 had been leased to the national carrier Cubana de Aviacion by a Mexican company called Damojh.
Allegations of previous safety complaints have begun to surface against the little-known company that leased the 40-year-old plane.
Damojh has declined to comment, while Damojh declined to comment while Mexico's Directorate General of Civil Aeronautics said an audit of the company would be undertaken to ensure it was still "fulfilling norms."
Cubana leased the jet less than a month ago, Transport Minister Adel Yzquierdo said yesterday. The carrier was struggling to meet demand for flights and was serving many domestic routes by bus instead.
Cuba often resorts to leasing due to the decades-old US trade embargo which makes it difficult to acquire newer aircraft, Mr Yzquierdo said.
Damojh operates three planes, according to the Mexican government.
Ovidio Martinez Lopez, a retired Cubana pilot, wrote in a widely-shared post on Facebook that Cuban airlines had leased planes from Damojh in 2010 and 2011, but one of its aircraft dropped off the radar while over the city of Santa Clara.
Cuban officials suspended the captain and co-pilot of that flight for "problems and serious lack of technical knowledge," he said, and Cuba's aviation security authority had recommended Cubana no longer lease from them.
Cuban investigators have so far recovered the cockpit voice recorder in "good condition," Mr Yzquierdo said, and are still looking for the flight data recorder.
Fifteen of the 110 victims have been identified so far. Authorities have said that 99 of the 105 passengers were Cuban, while two were Argentinians and one was Mexican.
There were 113 people on board the aircraft in total, including crew members.
Three Cuban women survived the crash, but are still in a critical condition.